Safety device for elevators.



PATENTED APR. 10, 1906.

TE. 'LUNDSTEN. DEVISE; 50R ELEVATORS.

API LIGATKOH FILED NOV. 16, 1905.

X? 1 i K x mm 62 i nnrrnn idTATE E dTT onion.

FRITZ LUNDSTEN, 0F CORONA, NEW YORK, ASSIGNOR OF ONE-HALF TO THEUDORESKiLSSON. OF ASTORIA, NEW YORK.

fife. 817,431.

fipecification of Letters Patent.

Eatented April 10, 1906.

Application filed November 16, 1905, Serial No. 287,554.

To all whom, it may concern:

Be it known that I, FRITZ LUNDSTEN, a citizen of the United States, anda resident of Corona, county of Queens, and State of New York, haveinvented a certain new and useful Improvement in Safety Devices forElevators, of which the following is a specification.

.My invention relates to safety devices for elevators; and its object isto improve upon structures of this kind now in use and to provide adevice for quickly and powerfully clamping an elevator-car to the guidesove which it is adapted to run.

I will describe my invention in the following specification and pointout the novel fea turcs thereof in claims.

Referring to the drawings, Figure 1 is a diagrammatic view, in sideelevation, of an elevator-car and certain connected apparatus which maybe used in carrying out my invention. Fig. 2 is a plan view, partly insec tion, of my safety device, showing sections of the guides which itis intended to clamp. Fig. 3 is a detail of certain of the parts shownin Fig. 2, but in different relative positions.

Fig. 4 is a side elevation of a part of the apparatus shown in Fig. 2.Fig. 5 is a sectional end view of certain of the parts, the sectionbeing taken through the line A B of Fig. 4. Fig. 6 is a detail of a cam.Fig. 7 is a detail of a part-of a tripping device which I use incarrying out my invention.

Like characters of reference designate cor responding parts in all ofthe figures.

1O designates an elevator-car to the bottom of which my device isattached.

1.1 is a hoisting-rope for the car.

12 is a governor-rope connected to run with the car. This governor'roperuns under a sheave 13, situated near one end of the cars travel. It maybe weighted, as at 15, and pawls 16 16 may be provided, if desired, toengage with ratchets in the sides of the weight 15 to prevent its upwardmovement.

v The governor-rope 12 runs over another sheave 14 near the other end ofthe cars travel, which is connected to a governor or speed regulator 17by suitable gearing 1-8. The speed-governor is arranged to actuate agripping device 19, which grips and positively locks the governor-ropewhenever the car runs in excess of normal speed. It mhy be regulated. orset to operate at any desired speed and may be arranged to operate whenthe car is running in either direction. The governor-rope is yieldinglyconnected to the car at 12 and is so arranged that when thegovernor-rope 12 is sto pod and the car continues to move it Wll pullawayfrom the yielding connection. This will cause he rope 12*, which isattached to governor-rope 12, to be pulled through the ulleys 12 12 andto be unwound from a di'um 31 on the safety device, and thereby impart arotary motion to the winding-drum 31. It is sometimes desirable torotate the winding-drum 31 by hand from the car, and for this purpose Ihave provided another rope 12 on the winding-drum and attached this ropeto a handle 12 within reach of the operator in the car.

I will now refer to Fig. 2 and describe the clamping device or safetydevice for the elevator-car, which is there illustrated. Thewinding-drum 31 is rotatably supported by brackets 34 34, which arerigidly mounted upon a frame 30 30, which holds the safety device andwhich is preferably attached to the bottom of an elevator-car. The drum31 may be grooved, as shown at 32, for the receptlon of the rope 12*,which is attached. to it. The inside of the drum is provided with rightand left hand screw-threads, in which screws 35 and 36 work. The outerend of these screws are attached to Wedgeshaped cams 25 25. 21 21designate gr1pping-jaws, which are eccentrically pivoted at 40 to theframe 30 in a manner which will be specifically pointed out later, as itforms an important part of my invention. These jaws are adapted to bemoved against and to clamp guides 22 22, over which the car 10 isarranged to run, and to thereby lock the car to the guides. The innerends of jaws 21 21 may be provided with antifriction-rollers 24 24,which are arranged to coact with the wedge-shaped cams 25, as will befully described hereinafter. 60 is a locking-lever which is pivoted at61 to a bracket 64, which is attached. to the frame 30. One end 62 ofthis locking-lever is held against a cam 7 0,

pivoted at l as follows: mounted in frame 30. A circular hub 42 iseccentrically attached to this pin. The jaw 21 is provided with acircular hole which fits over this hub. A short arm 44 is rigidlyattache-d to the outer end of pin l1, and the projecting lug 45, uponwhich. the end 63 of locking-lever 6U rests, is at the end of this shortarm. A spring 43 is provided for the purpose of turning pin 41 and itsattached parts around, when released, into the position shown in Fig. 3.he parts above described are the same for all. of the pivoted joints ofthe jaws 21, except that the short arm 46 of one of each pair of pivotsneed not have any projecting lug, such as 45, upon it. The cam 70, whichis on drum 31 and upon which one end of lever 60 rests, may be of theform shown in Fig. 6. The greater part of its surface is concentric withthe center line of the screws and 36. One or more depressions 72 may beprovided on its surface.

I will now describe the operation of this invention. Under usualconditions, when car is running, the various parts will be .he positionsin which they are shown in Eig. 2. it may be seen from this figure thatparts of the gripping-jaws 21 21 which are near the guides are so placedthat there is a considerable clearance between the jaws and the guides.This is a valuable feature, for it prevents all friction between theseparts while the car is running, and consequently there is no i. oar onthese parts. Whenever the car attains undue speed, so that the governor3? acts and causes the re e to be pullcdin the manner previouslyescribed, the windirig-drum 3.1 an the cams 70 will be turned thereby.The first effect of this movement will be to depress the end 62 oflockingdever 60 and a similar lever 60*, if more than one is provided,as is shown in Fig.

the concentric part 71 of cam 78 bein turned under the end of thislever. This wil raise the opposite end 63 of locking-lever 60 until itis clear of the projecting lug -15 on the end of the short arm 44. Itmay be seen in Fig. 2 that this short-arm 44 holds the short arm 46 fromturning. When the lockinglever releases these two arms 4-1 and 46, asjust described, the springs 43 43 will cause them and'the pins 41 11, towhich they are attached, to quickly rotated until they reach thepositions against stops l7 and 48 indicated at n and 46 in Fig. 2 bydotted lines. when the eccentric hubs are in this position, they willnot be returned to their iormer position by any pressure which may bebrought u on. them by the further operation of this d -vice, becausetheir position is such that the pressure of the jaws 21 upon them cannotforce them back. The ell'ect of this movement will be to quickly movethe ends of the gripping-jaws 21 up to the guides A pin 41 is looselybutitisnot necessary that this movement amass.

screws 35 and 36 to be moved toward each other and to thereby draw thewedge-shaped cams 25 25 together. These wedge-shaped cams will thus bedrawn in between the antifriction-rollers 24 24 and will cause the jaws21 21 to grip the guides 22 22 with great force. This will lock the car10 to the guides 22 22 and will thus bring it to rest, which of coursewill cause the movement of the winding-drum to cease. The various partsmay be reset by hand. If desired, springs 26 26 may be provided to keepthe jaws away from the guides when not forced on by the abovedescribedmechanism.

Means may be provided for o crating this device from the carindependenty of any action. of the governor 17. For this purpose rope 12may be attached to winding-drum 81 and led up through the car, as shownin Fig. 1, with a handle 12 attached to its end. It is obvious that ifan operator in the car pulls u on this handle 12 the operation of thedevice will be similar to that already de scribed.

This arrangement, which I have now described, provides an idealsafety-stop for elevators, as the parts when not in use are free fromwear and as its action is quick but is positive and powerful.

What I claim is I 1. In a safety device for elevators, the combinationof a car, guides for the car, grippingjaws upon the car, supports forsaid jaws and means for shifting the position of said supports. a

2. In a safety device for elevators, the combination of a car, guidesfor the car, gripping jaws upon the car, pivots for said jaws,means forshifting the position of the pivots and the jaws and additional meansfor moving the jaws.

. 3. In a safety device for elevators, the combination of a car, guidesfor the car, grippingjaws upon the car, pivots for the j aws,means forshifting the position of said pivots to ward the guides, and additionalmeans for tightening the jaws upon the guides.

41. In a safety device for elevators, the combination of a car, guidesfor the car, grippingjaws upon the car, pivots for the jaws, means 7 Forshifting the'position of the pivots toward the guides quickly andadditional means for tightening the jaws upon the guides more slowlywith greater force.

5. In a safety device for elevators, the combination of a car, jaws uponthe car, pivots for the jaws, springactuated means for shifting'theposition of the pivots toward the guides quickly and a screw fortightening the jaws upon the guides more slowly with greater force.

6. In a safety device for elevators, the comguides for the car,grippingsmear bination of a car, guides for the car, gripping jaws uponthe car, pivots for the guides,

spring actuated means for quickly shifting the position of the pivotstoward the guides, a locking device for said spring actuated mechanismand a screw mechanism arranged to tighten the jaws upon the guides.

.7. in a safety device for elevators, the cons loination of a car,guides for the car, grippingjaws upon the car, eccentric pivots for thejaws, s ring-actuated mechanism for turning sai eccentric pivots, alocking device for said springectuated mechanism, a cam for releasingsaid locking device and a screw mechanism arrangedto tighten the jawsupon the guides.

8. Ina safety device for elevators, the com loination of a car, guidesfor the car, grippingjaws upon the car, eccentric pivots l' r the jaws,spring-actuated mechanism for turning said eccentric pivots, a lockingdevice for said spring-actuated mechanism, a cam for releasing saidlocking device, a screw mechanism arranged to tighten the iaws upon theguides and means for actuating the cam and the screw by the motion. ofthe car,

9. In a safety device for elevators, the coinhination of a car, guidesfor the car, gri pingjaws upon the car, eccentric pivots or the jaws,spring-actuated mechanism for turning said eccentric pivots, a lockingdevice for said spring-actuated mechanism, scam for releasing saidlocking device, a screw mechanism arranged to tighten the jaws upon theguides, means for actuating the cam and the screw by the motion of thecar when this speed of the car has reached a predetermined limit.

10. In a safety device for elevators, the combination of a car, guidesfor the car, grip ping jaws upon the car, eccentric pivots for the jaws,springactuated mechanism for turning said eccentric pivots, a locking device for said spring-actuated mechanism, a cam for releasing saidloclring device, a screw mechanism arranged to tighten the ja is uponthe guides, means for actuating the cam and the screw bythe motion ofthe car when the speed of the car has reached a predetermined limit, andmeans for actuating the cam and the screw by hand. I

11. In a safety device for elevators, the

combination of a car, guides for the car, gripping-jaws upon the car,eccentric pivots for the jaws, s ring actuated mechanism for turning saieccentric pivots, clocking device iorsaid sprine actuated mechanism, acam -for releasing said locking device, a screw mechanism arranged totighten the upon the guides and a governor connected to run with the carand arranged to actuate the cam and the screw when the car has reached apredetermined limit.

12. In safety device tor elevators, the combination of car, guides forthe car, grip pingjaws ping-jaws upon the car, pivots for the jaws,mechanism to shift the position of the pivots toward the guides, anormally compressed spring arran ed to actuate said mechanism, and ascrew or tightening the jaws upon the 3U guides.

13. in a safety device for elev tors, the combination of a car, guidesfor-tin: ear, gripping-jaws upon the car, pivots for the jaws, mechanismto shift the position oi the pivots toward the guides, anormallycompressed spring arranged. to actuate said mechanism, means forreleasing said springs and a screw tor tightening the jaws upon theguides.

14. in a safety device for elevators, the combination of a car, guidesfor the car, gripping-jaws upon thecar, eccentric pivots for the laws,means for turning said eccentric pivots, a spring arranged to actuatesaid pivot-turning means and to thereby move the jaws toward the guidesand to pcsitiveiy hold. thciii in their moved. position. and i'urthcrmeans for positively tightening the jaws upon the guides.

15. In'a safety device for elevators, the combination of a car, guidesfor the car, gripupon the car, pivots for jaws, spring-actuated meansfor shifting the po. tion of tho pivots toward the guides quit dy andright and left hand screws for tighteidng the jaws upon the guides moreslowly with greater force. 4

.16. In a safety device for elevators, the combination of a car, guidesfor the car, ping-jaws upon the car, eccentric pivots ior the java,springactuated mechanism iciturning said eccentric pivots, a lockingdevice for said spring-actuatcd mechanism, a cam for releasing saidlocking device and. right and left hand screws arranged to tighten. thejaws upon the guides.

17. In a safety device for elevators, combination of a car, guides orthe ping jaws upon. the car, eccentric .fots or the jaws,spring-actuated mechai for turning said eccentric pivots, a loclnng de iice for said spring-actuated mechanism, a cam for releasing said lockingdevice, right and left hand screws arranged to tighten the 5 upon theguides and means for actuat' 1 earn and the screws by the motion of in1.8. in a safety device for elevators, comi-iination of a car, guidesfor the car, 3' ping jaws upon. the car, eccentric pivots the jaws,spring-actuated mccl'ia'nisni turning said eccentric pivots, a lockingdevice, for said spring-actuated mechanism, a cam for releasing saidlocking device, right and left hand screws arranged to tighten the jaws"upon the guides, means for actuating the cam and the screws by themotion of the car when the speed of the car has reached a predeterminedlimit. I 19. In a satet deviceior' elevators, the

combination oil a car, guides for the car, grip-- ed to run with &

ping-jaws upon the car, eccentric pivots for the jaws, s ringactuatedmechanism, for turning sai eccentric pivots,. a locking de vice for saidspring-actuated mechanism, a cam for releasing said locking device,right and left hand screws arranged to tighten the jaws upon the guidesand a governor connectthe car and arranged to actuate the cam and thescrews when the car has reached a predetermined limit.

20. In a combination of a car, guides for the car, gripping-jaws uponthe car, eccentric pivots for the jaws, spring actuated mechanism forturning said eccentric pivots, a locking device safety device forelevators, the

FRITZ LUNDSTENJ Witnesses i Jossrrr E. CAVANAUGH, E. W. MARSHALL.

means for actuat-

